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The process of sending a signed email using a digital certificate.
Hello, it is recommended that you use secret messages to encrypt the mail client. You just need to log in to your email account. Secret letter App automatically applies for e-mail encryption certificate and signature certificate, automatically deploys and configures e-mail certificate, automatically exchanges public keys of encryption certificate, automatically encrypts and signs each e-mail by default, automatically stamps each e-mail, automatically decrypts encrypted e-mail, and automatically updates expired encryption certificate and signature certificate. More importantly, the signing certificate and encryption certificate of V 1 automatically configured by default are completely free.